Slightly insane airborne hydroelectric powerplant. The idea is to use a tethered blimp holding a fog/dew/cloud catching screen to grab water from air/clouds, with the tether doubling as a tube. The hydraulic head is non-trival, and can be shunted through through a water turbine to make power and recover the water for purification. If the generated power is enough, I suppose you could generate hydrogen gas on site for the blimps.

Some kind of stealth startup in the CAES field, using some sort of hydraulic based air compression system, and using water mist to capture compression heat and to reduce tank temperature post compression.